Segments (Operating Profit By Segment And Reconciliation Of Segment Operating Profit To Earnings Before Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 28, 2026	Mar. 29, 2025	Mar. 28, 2026	Mar. 29, 2025
Segment Reporting
Operating profit	$ 137,937	$ 109,051	$ 273,383	$ 212,655
Deductions from operating profit:
Interest expense	15,540	19,548	32,735	35,796
Equity-based compensation expense	4,770	3,695	$ 9,725	8,020
Non-service pension expense			Other Nonoperating Income (Expense)
Non-service pension expense	1,147	1,939	$ 2,277	3,885
Corporate and other expenses, net	7,661	11,811	18,613	18,461
Earnings before income taxes	108,819	72,058	210,033	146,493
Depreciation, Depletion and Amortization	28,035	24,656	55,633	49,408
Segment Reporting, Long-Lived Asset, Expenditure for Addition	31,798	37,604	66,178	70,382
Space And Defense
Segment Reporting
Operating profit	43,265	32,778	86,035	61,558
Deductions from operating profit:
Depreciation, Depletion and Amortization	7,227	5,758	14,329	11,323
Segment Reporting, Long-Lived Asset, Expenditure for Addition	10,963	15,911	24,335	30,316
Military Aircraft
Segment Reporting
Operating profit	32,310	23,716	60,438	47,325
Deductions from operating profit:
Depreciation, Depletion and Amortization	10,270	8,204	19,950	16,340
Segment Reporting, Long-Lived Asset, Expenditure for Addition	9,489	10,850	19,706	19,253
Commercial Aircraft
Segment Reporting
Operating profit	29,316	25,347	57,730	51,114
Deductions from operating profit:
Depreciation, Depletion and Amortization	4,224	4,436	8,815	9,176
Segment Reporting, Long-Lived Asset, Expenditure for Addition	5,561	4,541	12,482	7,555
Industrial
Segment Reporting
Operating profit	33,046	27,210	69,180	52,658
Deductions from operating profit:
Depreciation, Depletion and Amortization	6,277	6,212	12,466	12,476
Segment Reporting, Long-Lived Asset, Expenditure for Addition	5,778	6,268	9,642	13,217
Corporate Segment
Deductions from operating profit:
Depreciation, Depletion and Amortization	37	46	73	93
Segment Reporting, Long-Lived Asset, Expenditure for Addition	$ 7	$ 34	$ 13	$ 41